Less than week after George Zimmerman's wife filed for divorce and told ABC News that she thought her husband felt "more invincible" after he was acquitted in the shooting death of 17-year-old Trayvon Martin, Mr. Zimmerman came under police investigation Monday afternoon for a claim of domestic battery involving a gun.

Zimmerman's now-estranged wife, Sherrie, dialed 911 from their shared home in Lake Mary, Fla., and told a police operator that Mr. Zimmerman had "punched my dad in the nose" and "is about to shoot us," according to CBS news.

Mr. Zimmerman was released after a brief police detention, and three hours after placing her call, Ms. Zimmerman announced that she would not press charges.

But the incident has returned Mr. Zimmerman to the media spotlight less than two months after his acquittal of manslaughter and murder charges by a Florida jury provoked nationwide protests and kindled questions about gun ownership, "stand your ground" laws, and racial bias in the court system. Mr. Zimmerman, a volunteer neighborhood watch captain, said that he shot Trayvon, who was black, in self-defense.

During her 911 call Monday, Ms. Zimmerman said, according to a report in the Chicago Tribune: "He's in his car and he continually has his hand on his gun and keeps saying step closer ... and he's gonna shoot us."